Stove-grate



. (N0 ModeL.) 2 SheetsSheet 1 G. L. FARWELL. STOVE GRATE Patented Sept. 10,1895.

minesse/s Ini'entor:

(No Model.) 2 Sheets-Sheet 2.

G. L. PARWELL,

STOVE GRATE Patented Sept. 10

G ollfmvreap TATES A NT Erica.

GEORGE L. FARWELL, OF ST. PAUL, MINNESOTA.

STOVEeG RATE.

SPECIFICATION forming part of Letters Patent No. 545,951, dated September 10, 1895.

Application filed April 30. 1894'" Serial No. 509,529. (No model.)

To all whom it may concern:

Be it known that 1, GEORGE L. FARWELL, of St. Paul, Ramsey county, Minnesota, have invented certain Improvements in Stove: grates, of which the following is a specificaion. My invention relates to improvements in stove-grates, its object being to provide a grate adapted to the consumption of linite coal and similar fuels which crumble and ininally disintegrate in the process of combus- 1on.

To this end my invention consists in pro viding the fire-box with an ordinary fuel-supporting grate and a secondary grate underneath the same with a sufficient intermediate airspace to permit of free circulation of air and consequent combustion of any fuel upon the secondary grate. This secondary grate is preferably of stepped form, with horizontal openings through the rise of the step and with small vertical openings through the body of the grate. It may also be formed double, with one part slidable upon the other, whereby the vertical openings may be made to register with each other or be partially or entirely closed. In order to introduce air into the space between the upper and lower grates to assist the process of combustion of the fuel which falls through the openings of the upper grate, I provide a large opening through the lower grate and cover the same with a tubular conduit having lateral openings or vents and an imperforate hood or dome. This hood projects into but does not close a similar opening in the upper grate, and supports the fuel directly above it. By this means any unconsumed fuel falling through the openings of the main grate is caught and con sumed upon the secondary grate.

My invention further consists in the construction and combination hereinafter par- I ticularly described and claimed.

In the accompanying drawings, forming part of this specification, Figure 1 is a plan view of a circular fire-box provided with my improved grate. Fig. 2 is a diametrical vertical section of the same. Fig. 3 is a detail of the interlocking device between the upper and lower grates. Fig. 4 is a longitudinal vertical section of a rectangular fire-box fitted with my improved grate. Fig. 5 is a vertical cross-section of thesame on line y y of Fig. 4.. Fig. 6 is a plan View of a rectangular fire-box fitted with an alternative construction of grate, and Fig. 7 is a vertical crosssection of the same on line a: a: of Fig. 6.

In the drawings, the wall 2 of the stove is provided with a horizontal annular rib or shelf 3, upon which is hung by its flange 5 the fire-box 4.. The box has a bottom interior annular flange 6, upon which is supported the circular double grate A, consisting of two similar superposed series of annular flat bars 7 and 8, respectively, connected by the lugs 9 and 10. Supported upon and preferably cast integral with the lower series of bars 7 is the dome or hood 12, having lateral openings or slots 13 for the admission of air above the grate.

14 is the upper or main fuel-supporting grate, which rests upon the inwardly-projecting annular rib or shelf 15 upon the inside of the fire-box. The spaces 16 between the'lugs 9 and 9 and 10 and 10 serve as lateral openings for the air to pass through the lower double grate, and the upper grate is provided with openings 17 therethrough. The upper grate also has a central relatively large circular opening 18, into which the dome or hood 12 projects but does not fill, thus serving as an auxiliary support for the fuel, with space between it and the edge of the opening for ashes and other refuse to pass through. The bars of the lower grate are provided with vertical openings 19, which normally do not register with each other, but may be brought into registering position by partially rotating the upper upon the lower series by means of the attached handle 20, which projects through the side of the stove. Motion is also communicated to the upper grate from the handle 20,

so as to dislodge the ashes and clinkers thereon. This is accomplished by means of the U-shaped arm 21, Fig. 3, attached to the upper grate, with its depending ends 22 passing upon either side of the handle 20, so that when the handle is moved laterally it will strike one of the ends 22 moving the upper grate.

Figs. 4. and 5 illustrate a modification of my invention. In this construction the fire-box 23 is of rectangular form, having top flanges 24, by means of which it is hung in the stove,

and provided with interior ribs 25, on which the top grate 26is supported, and also having interior flanges 2'7 supporting the grate B. As shown, this lower grate is of stepped form and double, one plate being slidable upon the other by means of the handle 28, so as to cause the corresponding openings in them to partially or wholly register or to be entirely closed.

The lower grate is provided with the domes or hoods 12 of the same construction and arranged with reference to the openings in the top grate in the same manner as shown in Figs. 1 and 2.

In the construction shown in Figs. 6, and 7 the lower grate O is plane-surfaced, but double, having corresponding openings 29 through both plates, the top plate being slidable upon the other by means of the handle 30 extending through the end of the fire-box, so as to partially or wholly register or to close the openings 29 in the two plates. The lower grate 0 supports the domes or hoods 12, constructed and arranged in the same manner as those shown in the other forms. The openings 31 in the upper grate are preferably somewhat larger than those in the grate O.

In operation the fuel placed upon the upper grate is ignited and burns as with ordinary grates, the small unconsumed particles dropping through openings onto the lower grate, in which the vertical openings are normally closed. The air admitted through the lateral openings in the dome between the grates furnishes means for consuming the fuel thus deposited on the lower grate, the ashes being shaken through the openings in the lower grate by oscillating or reciprocating the same, as above described.

I claim 1. In a stove, the combination with thefire box, of the main fuel supporting grate arranged beneath the same, and the centrally arranged air conduit for admitting the air from the ash pit through the secondary grate and distributing the same laterally between said grates.

2. In a stove, the combination with its fire 5 box, of the main fuel supporting grate, the

lateral openings between said grates.

lateral vents.

4. In a stove, the combination with the fire- 1 box, of the fuel supporting grate, the secondary grate arranged underneath the same, the

stationary dome or hood supported upon the secondary grate and projecting slightly into but not filling an opening in the fuel supporting grate, said dome having a bottom air inlet and lateral air outlets.

5. In a stove, the combination with the fire box, of the fuel supporting grate, and underneath the same with intermediate space the double grate consisting of two similar superposed grates having an opening therethrough, and the dome or hood covering said grate opening having lateral openings in its supporting walls adapted to admit air directly therethrough to the under side of said fuel supporting grate.

6. In a stove, the combination with the fire box, of the fuel supporting grate, and underneath the same with intermediate space the double grate, consisting of series of parallel overlapping bars with intermediate spaces and having an opening through both of said series of bars and the dome or hood covering said grate opening and having lateral openings in its supporting walls adapted to admit air directly therethrough to the under side of said fuel supporting grate.

7. In a stove, the combination with the fire box, of the fuel supporting grate, and underneath the same with intermediate space the double grate, consisting of series of parallel bars arranged in step by step position with intermediate spaces and having an opening through both of said series, and the dome or hood covering said grate opening with lateral openings underneath it adapted to admit air directly th erethrough to the under side of said fuel supporting grate.

8. In a stove, the combination with the fire box, of the main grate, the secondary grate arranged underneath the same with intermediate space and having an opening therethrough, and constructed of step by step series of parallel bars with intermediate spaces and connecting lugs, and the imperforate dome or hood supported above and covering said opening and having lateral openings in its supporting walls.

9. In a stove, the combination with the fire box, of the fuel supporting grate, the secondary grate arranged underneath the same with intermediate space and having an opening therethrough, and the dome or hood covering said opening and having lateral openings underneath it adapted to admit air directly to 3. In a stove, the combination with its fire. box and ash pit, of the main fuel supporting 1 grate, the secondary grate having relatively smaller openings than said first named grate, and arranged intermediate of it and said ash j pit, the vertical, centrally arranged air con-f duit between said grates communicating with the ash pit through an opening in said sec-; ondary grate, and having a closed top and the under side of said fuel supporting grate.

10. In a stove, the combination with the tire box, of the fuel supporting grate, the secondary grate arranged underneath the same with intermediate space and consisting of step by step series of bars with intermediate spaces, said grate having an opening therethrough, and the dome or hood covering said opening provided with lateral openings underneath it 1 adapted to admit air directly to the under side of said fuel supporting grate.

11. In a stove, the combination with the fire box, of the main grate, the secondary grate IIO arranged underneath the same with intermediate space, the relatively large registering openings in both of said grates, the imperferate dome or hood entering but not filling the opening in the main grate and the perforate support for said dome or hood.

12. In a stove, the combination with the main and secondary grates,- of projections rigidly fixed to one grate and loosely engaging the other, whereby the movement of one grate beyond fixed limits imparts similar movement to the other grate.

13. In a stove, the combination with the firebox, of the upper and lower grates arranged therein with intermediate space, and the loose connection between said grates whereby the oscillating or sliding movement of one grate beyond certain limits imparts a like motion GEORGE L. FARWELL. Witnesses:

T. D. MERWIN, H. S. JOHNSON. 

